Hi,
RFC2461 specifies in section 7.2.6 that a host may send unsolicited
NA(s) for example when its link layer address changes or IP address is
added to inform the neighbors that their ND cache may need to be
updated.
Some current routers (probably) erroneously depend on this to reduce
the "downtime" if an IP address is moved from one host to another
(otherwise they'll continue to forward packets to the old link-layer
address until their ND cache timeouts).
I tested this behaviour on Linux 2.6.18 and FreeBSD 6.2 and neither
sends these unsolicited NAs when an IP address is configured. Is
there a reason not to add this optimization?
--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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